/// <summary>
/// 获取属性值
/// </summary>
/// <param name="obj">对象</param>
/// <param name="index">检索</param>
/// <returns></returns>
public Object GetValue(Object obj, Object[] index)
{
if (getHandler != null)
{
return(getHandler(obj, index));
}
Int32 moduleKey = info.Module.GetHashCode();
Int32 handlerKey = info.MetadataToken;
getHandler = DynamicCacheFactory <DynamicPropertyGetHandler> .Caches
.GetOrAdd(moduleKey, innerModuleKey => new ConcurrentDictionary <Int32, DynamicPropertyGetHandler>())
.GetOrAdd(handlerKey, innerHandlerKey => DynamicMethodFactory.CreateGetHandler(type, info));
return(getHandler(obj, index));
}
/// <summary>
/// 创建动态属性取值的委托
/// </summary>
/// <returns>动态属性取值的委托</returns>
/// <param name="property">属性</param>
public static DynamicPropertyGetHandler CreateDynamicPropertyGetHandler(PropertyInfo property)
{
// 如果缓存中存在
if (dynamicPropertyGetHandlers.ContainsKey(property))
{
return(dynamicPropertyGetHandlers[property]);
}
#region Emit 由于老是有安全性问题，使用 Expression 替代
// DynamicMethod method = new DynamicMethod( string.Format( "DynamicPropertyGet{0}", Guid.NewGuid() ), typeof( object ), new[] { typeof( object ) }, true );
//
// ILGenerator gen = method.GetILGenerator();
//
// gen.DeclareLocal( typeof( object ) );
//
// gen.Emit( OpCodes.Ldarg_0 );
// gen.Emit( OpCodes.Castclass, property.DeclaringType );
//
// gen.EmitCall( OpCodes.Call, property.GetGetMethod(), null );
//
// if( property.GetGetMethod().ReturnType.IsValueType )
// {
// gen.Emit( OpCodes.Box, property.GetGetMethod().ReturnType );
// }
//
// gen.Emit( OpCodes.Stloc_0 );
// gen.Emit( OpCodes.Ldloc_0 );
//
// gen.Emit( OpCodes.Ret );
//
// DynamicPropertyGetHandler handler = (DynamicPropertyGetHandler)method.CreateDelegate( typeof( DynamicPropertyGetHandler ) );
#endregion
var instance = Expression.Parameter(typeof(object));
var castInstance = Expression.Convert(instance, property.DeclaringType);
var value = Expression.Property(castInstance, property);
var castValue = Expression.Convert(value, typeof(object));
DynamicPropertyGetHandler handler = Expression.Lambda <DynamicPropertyGetHandler>(castValue, instance).Compile();
dynamicPropertyGetHandlers.Add(property, handler);
return(handler);
}
/// <summary>
/// 创建动态属性取值的委托
/// </summary>
/// <returns>动态属性取值的委托</returns>
/// <param name="property">属性</param>
public static DynamicPropertyGetHandler CreateDynamicPropertyGetHandler(PropertyInfo property)
{
// 如果缓存中存在
if (dynamicPropertyGetHandlers.ContainsKey(property))
{
return(dynamicPropertyGetHandlers[property]);
}
DynamicMethod method = new DynamicMethod(string.Format("DynamicPropertyGet{0}", Guid.NewGuid()), typeof(object), new[] { typeof(object) }, true);
ILGenerator gen = method.GetILGenerator();
gen.DeclareLocal(typeof(object));
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Castclass, property.DeclaringType);
gen.EmitCall(OpCodes.Call, property.GetGetMethod(), null);
if (property.GetGetMethod().ReturnType.IsValueType)
{
gen.Emit(OpCodes.Box, property.GetGetMethod().ReturnType);
}
gen.Emit(OpCodes.Stloc_0);
gen.Emit(OpCodes.Ldloc_0);
gen.Emit(OpCodes.Ret);
DynamicPropertyGetHandler handler = (DynamicPropertyGetHandler)method.CreateDelegate(typeof(DynamicPropertyGetHandler));
//DynamicPropertyGetHandler handler = (DynamicPropertyGetHandler)Delegate.CreateDelegate(typeof(DynamicPropertyGetHandler), newType.GetMethod("DynamicPropertyGet"));
dynamicPropertyGetHandlers.Add(property, handler);
return(handler);
}
/// <summary>
/// 根据PropertyInfo和对象获取对应值
/// </summary>
/// <param name="propertyInfo"></param>
/// <param name="obj">PropertyInfo所在对象</param>
/// <param name="index">如果是一个索引Property，请指定索引值，否则，指定null</param>
/// <returns>返回值</returns>
public static object GetValue(PropertyInfo propertyInfo, object obj, object[] index)
{
DynamicPropertyGetHandler handler = null;
int key = propertyInfo.MetadataToken;
#if Server
handler = CachePropertyGet.GetOrAdd(key, new Func <int, DynamicPropertyGetHandler>((i) => CreateGetHandler(propertyInfo)));
#else
lock (CachePropertyGet)
{
if (CachePropertyGet.ContainsKey(key))
{
handler = CachePropertyGet[key];
}
else
{
handler = CreateGetHandler(propertyInfo);
CachePropertyGet.Add(key, handler);
}
}
#endif
return(handler(obj, index));
}
/// <summary>
/// 使用 Emit 方式获取属性值
/// </summary>
/// <param name="property"></param>
/// <param name="instance"></param>
/// <returns></returns>
public static object EmitGetValue(this PropertyInfo property, object instance)
{
DynamicPropertyGetHandler handler = DynamicHelper.CreateDynamicPropertyGetHandler(property);
return(handler(instance));
}
